Article of footwear

ABSTRACT

An article of footwear includes a sole and an upper. The upper includes a single fabric portion including a base layer having breathability. The single fabric portion includes: a strength portion including the base layer, a breathable layer, and a strength layer; and a breathable portion including only the base layer or only the base layer and the breathable layer. The base layer has a shape extending from a toe region located at a front end in a longitudinal direction of the article of footwear to reach a heel region located at a rear end thereof. The strength portion includes: a toe strength portion disposed in the toe region; and a heel strength portion disposed in the heel region. The breathable portion includes an intermediate breathable portion disposed in an intermediate region located between the toe region and the heel region.

TECHNICAL FIELD

The present disclosure relates to an article of footwear.

BACKGROUND ART

An article of footwear including a sole and an upper has been known, as found for example in Japanese Patent No. 6068775.

CITATION LIST Patent Literature

PTL 1: Japanese Patent No. 6068775

SUMMARY OF INVENTION Technical Problem

An upper of an article of footwear as disclosed in Japanese Patent No. 6068775 is required to have various functions. For example, a toe region of the upper located at the front end in the longitudinal direction of the article of footwear, and a heel region of the upper located at the rear end in the longitudinal direction may be required to have high rigidity (strength), and an intermediate region of the upper located in a middle portion in the longitudinal direction of the article of footwear may be required to be breathable. In this case, the upper can be made of a fabric having high breathability and another fabric having relatively high rigidity can be connected by bonding or sewing or the like to the toe region and the heel region of the upper.

However, another fabric bonded to the breathable fabric may add the weight of the upper and/or may make the upper partially harder, due to a bonding adhesive. Another fabric sewn to the breathable fabric may also add the weight of the upper due to a seam allowance required for the upper.

An object of the present disclosure is to provide an article of footwear that enables both breathability of the intermediate region and rigidity of the toe region and the heel region to be ensured, without performing bonding or sewing.

Solution to Problem

An article of footwear according to an aspect of the present disclosure is an article of footwear including a sole and an upper. The upper includes a single fabric portion including a base layer having breathability. The single fabric portion includes: a strength portion including the base layer, a breathable layer having breathability, and a strength layer made of a single yarn or a plurality of yarns and connecting the base layer and the breathable layer to each other; and a breathable portion including only the base layer or only the base layer and the breathable layer. The base layer has a shape extending from a toe region located at a front end in a longitudinal direction of the article of footwear to reach a heel region located at a rear end in the longitudinal direction of the article of footwear. The strength portion includes: a toe strength portion disposed in the toe region; and a heel strength portion disposed in the heel region. The breathable portion includes an intermediate breathable portion disposed in an intermediate region located between the toe region and the heel region.

Advantageous Effects of Invention

According to the present disclosure, an article of footwear is provided that enables both breathability of the intermediate region and rigidity of the toe region and the heel region to be ensured, without performing bonding or sewing.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a plan view schematically showing an article of footwear according to Embodiment 1 of the present disclosure.

FIG. 2 is a left side view of the article of footwear shown in FIG. 1 .

FIG. 3 is a right side view of the article of footwear shown in FIG. 1 .

FIG. 4 is a cross-sectional view schematically showing a configuration of a single fabric portion.

FIG. 5 is a developed view of an upper of the article of footwear shown in FIG. 1 .

FIG. 6 is a plan view showing a modification of the upper shown in FIG. 5 .

FIG. 7 is a plan view showing a modification of the upper shown in FIG. 5 .

FIG. 8 is a developed view of an upper of an article of footwear according to Embodiment 2 of the present disclosure.

FIG. 9 is a cross-sectional view along a line IX-IX in FIG. 8 .

FIG. 10 is a plan view schematically showing an article of footwear according to Embodiment 3 of the present disclosure.

FIG. 11 is a developed view of an upper of an article of footwear according to Embodiment 4 of the present disclosure.

FIG. 12 is a developed view of an upper of an article of footwear according to Embodiment 5 of the present disclosure.

FIG. 13 is a plan view showing a modification of the upper shown in FIG. 12 .

FIG. 14 is a developed view of an upper of an article of footwear according to Embodiment 6 of the present disclosure.

FIG. 15 is a developed view of an upper of an article of footwear according to Embodiment 7 of the present disclosure.

DESCRIPTION OF EMBODIMENTS

Embodiments of the present disclosure are described with reference to the drawings. In the drawings referenced below, the same or corresponding parts are denoted by the same reference numerals. In the following description, terms such as longitudinal direction, width direction, frontward, and rearward are used. Each of these terms representing the direction refers to the direction as seen from a viewpoint of a wearer of an article of footwear 1 placed on a flat plane such as ground. For example, frontward refers to toward the toe and rearward refers to toward the heel. Moreover, medial foot side refers to the inner side (first-toe side) of a foot in the width direction, and lateral foot side refers to the outer side of the foot in the width direction.

Embodiment 1

FIG. 1 is a plan view schematically showing an article of footwear according to Embodiment 1 of the present disclosure. FIG. 2 is a left side view of the article of footwear shown in FIG. 1 . FIG. 3 is a right side view of the article of footwear shown in FIG. 1 . While FIGS. 1 to 3 show the article of footwear 1 for the left foot, the article of footwear 1 is also applicable to the right foot and, in this case, symmetrical to the article of footwear 1 for the left foot. The article of footwear 1 according to the present embodiment is applicable for use as a sports shoe or walking shoe, for example, and the use of the article of footwear is not limited to a particular one.

As shown in FIGS. 1 to 3 , the article of footwear 1 includes a sole 5 and an upper 10.

The upper 10 is connected to the sole 5 and forms, together with the sole 5, a space for receiving a foot. The upper 10 includes a medial foot covering portion 11, a lateral foot covering portion 12, a topline 10 h 1, and a slit 10 h 2.

The medial foot covering portion 11 is a portion that covers at least a part of the medial foot surface of a foot. The medial foot covering portion 11 is formed by a portion of the upper 10 that extends inward (rightward in FIG. 1 ) from a centerline A extending through the center in the width direction of the article of footwear 1. The centerline A may be a line in the article of footwear 1 located to correspond to a line connecting the center of the heel bone of a foot of a standard wearer of the article of footwear 1, and a point between the first toe and the second toe of the foot, rather than the centerline in the width direction of the article of footwear 1. While the inner side and the outer side are defined with respect to the centerline in the width direction of the article of footwear 1, this definition is not strict.

The lateral foot covering portion 12 is a portion that covers at least a part of the lateral foot surface of a foot. The lateral foot covering portion 12 is formed by a portion of the upper 10 that extends outward (leftward in FIG. 1 ) from the centerline A.

The topline 10 h 1 is located between the medial foot covering portion 11 and the lateral foot covering portion 12 in the width direction of the article of footwear 1, for allowing a foot to be inserted and removed.

The slit 10 h 2 is an opening having a shape extending frontward from the topline 10 h 1 in the longitudinal direction of the article of footwear 1. The slit 10 h 2 is located in an intermediate region R3. The intermediate region R3 is a region located between a toe region R1 located at the front end in the longitudinal direction of the article of footwear 1, and a heel region R2 located at the rear end in the longitudinal direction of the article of footwear 1.

The toe region R1 is a region located across a range of approximately 0% to 4% with respect to the total length of the article of footwear 1 from the front end toward the rear end of the article of footwear 1. The intermediate region R3 is a region located across a range of approximately 4% to 80% with respect to the total length of the article of footwear 1 from the front end toward the rear end of the article of footwear 1. The heel region R2 is a region located across a range of 80% to 100% with respect to the total length of the article of footwear 1 from the front end toward the rear end of the article of footwear 1.

As shown in FIG. 4 , the upper 10 has a single fabric portion 100 including a base layer 101 having breathability. The base layer 101 has a shape extending from the toe region R1 to reach the heel region R2. The base layer 101 is made of a mesh fabric, for example. The single fabric portion 100 is made of a knitted material.

The single fabric portion 100 includes a strength portion 110 and a breathable portion 120. In each drawing, the strength portion 110 is depicted in a dot pattern, and the breathable portion 120 is depicted in a mesh pattern.

The strength portion 110 includes the base layer 101, a breathable layer 102, and a strength layer 103.

The breathable layer 102 is a layer having breathability. The breathable layer 102 is made of a mesh fabric, for example. The breathable layer 102 may be made of the same fabric as the base layer 101.

The strength layer 103 is located between the base layer 101 and the breathable layer 102. The strength layer 103 is made of a single fiber or a plurality of fibers. In the present embodiment, the strength layer 103 is made of a twisted yarn(s) (Z-twist yarn(s), for example). The strength layer 103 may alternatively be made of a zero-twist yarn(s). The strength layer 103 connects the base layer 101 and the breathable layer 102 to each other. Specifically, the strength portion 110 is formed by sewing the base layer 101 and the breathable layer 102 with the strength layer 103.

As shown in FIGS. 1 to 3 and 5 , the strength portion 110 includes a toe strength portion 111 and a heel strength portion 112. The strength portion 110 may be provided with a plurality of through holes h.

The toe strength portion 111 is located in the toe region R1. The outer edge of the toe strength portion 111 has a shape extending along the front end portion of the upper 10. The toe strength portion 111 has a shape curved to protrude toward the front end.

The heel strength portion 112 is located in the heel region R2. A rear end portion of the heel strength portion 112 has a shape extending from the sole 5 to reach the topline 10 h 1. The heel strength portion 112 has a shape extending gradually away from the topline 10 h 1 as it extends toward the toe region R1.

As shown in FIG. 4 , the breathable portion 120 includes a single layer portion 120A and a double layer portion 120B.

The single layer portion 120A includes only the base layer 101.

The double layer portion 120B includes only the base layer 101 and the breathable layer 102. The breathable layer 102 of the double layer portion 120B is contiguous with the breathable layer 102 of the strength portion 110 adjacent to this double layer portion 120B.

As shown in FIGS. 2, 3, and 5 , the breathable portion 120 includes a toe breathable portion 121, a heel breathable portion 122, and an intermediate breathable portion 123. The breathable portion 120 may be provided with a plurality of through holes h.

The toe breathable portion 121 is located in the toe region R1. The heel breathable portion 122 is located in the heel region R2. The intermediate breathable portion 123 is located in the intermediate region R3. The toe breathable portion 121 and the heel breathable portion 122 may not be provided.

In the present embodiment, the toe breathable portion 121, the heel breathable portion 122, and the intermediate breathable portion 123 are formed of only the single layer portion 120A. At least one of the toe breathable portion 121, the heel breathable portion 122, and the intermediate breathable portion 123 may be formed of the double layer portion 120B.

The ratio of the area of the breathable portion 120 to the area of the strength portion 110 in the intermediate region R3 is higher than the ratio of the area of the breathable portion 120 to the area of the strength portion 110 in each of the toe region R1 and the heel region R2.

As set forth above, in the article of footwear 1 according to the present embodiment, the base layer 101 forming a part of the strength portion 110 and the breathable portion 120 has a shape extending from the toe region R1 to reach the heel region R2, and therefore, breathability of the intermediate region R3 given by the intermediate breathable portion 123, rigidity of the toe region R1 given by the toe strength portion 111, and rigidity of the heel region R2 given by the heel strength portion 112 can be ensured without performing bonding or sewing.

In the present embodiment, as shown in FIG. 6 , the upper 10 may be provided with an opening h 10 in a region located frontward of the slit 10 h 2.

Alternatively, as shown in FIG. 7 , the medial foot covering portion 11 and the lateral foot covering portion 12 of the upper 10 may be provided, in their part around the slit 10 h 2, with insert holes h 20 for inserting a shoelace therein.

Embodiment 2

Next, with reference to FIGS. 8 and 9 , an upper 10 of an article of footwear 1 according to Embodiment 2 of the present disclosure is described. In connection with Embodiment 2, only those parts different from Embodiment 1 are described, and the description of the same structures, functions, and effects as Embodiment 1 is not herein repeated.

In the present embodiment, a strength portion 110 further includes a plurality of intermediate strength portions 113 arranged in the intermediate region R3. Each intermediate strength portion 113 has a shape extending in the direction from the heel region R2 to toward the toe region R1. The plurality of intermediate strength portions 113 are arranged at intervals in the width direction of the article of footwear 1.

An intermediate breathable portion 123 includes a plurality of longitudinal breathable portions 123 a. Each longitudinal breathable portion 123 a has a shape extending in the direction from the heel region R2 toward the toe region R1. The intermediate strength portions 113 and the longitudinal breathable portions 123 a are arranged alternately in the width direction. The longitudinal breathable portions 123 a may extend to reach the toe region R1 and the heel region R2.

As shown in FIG. 9 , a base layer 101 is disposed to form an outer surface of the upper 10.

In this way, a flow path having a shape extending in the direction from the heel region R2 toward the toe region R1 is formed between a foot in the article of footwear 1 and the base layer 101 of the upper 10 and between a pair of intermediate strength portions 113 adjacent to each other in the width direction, and therefore, breathability of the intermediate region R3 is effectively ensured.

Embodiment 3

Next, with reference to FIG. 10 , an upper 10 of an article of footwear 1 according to Embodiment 3 of the present disclosure is described. In connection with Embodiment 3, only those parts different from Embodiment 1 are described, and the description of the same structures, functions, and effects as Embodiment 1 is not herein repeated.

In the present embodiment, a strength portion 110 further includes a plurality of inner strength portions 114 and a plurality of outer strength portions 115.

A plurality of inner strength portions 114 are arranged in the intermediate region R3 of a medial foot covering portion 11. Each inner strength portion 114 has a shape inclined gradually toward the toe region R1, as it extends in the direction from the sole 5 toward the slit 10 h 2.

A plurality of outer strength portions 115 are arranged in the intermediate region R3 of a lateral foot covering portion 12. Each outer strength portion 115 has a shape inclined gradually toward the heel region R2, as it extends in the direction from the sole 5 toward the slit 10 h 2.

An intermediate breathable portion 123 includes a plurality of inner inclined breathable portions 123 b and a plurality of outer inclined breathable portions 123 c.

Each inner inclined breathable portion 123 b is formed in a medial foot covering portion 11. More preferably, each inner inclined breathable portion 123 b in the medial foot covering portion 11 is formed frontward of the topline 10 h 1. Each inner inclined breathable portion 123 b has a shape inclined gradually toward the toe region R1 as it extends in the direction from the sole 5 toward the slit 10 h 2. The inner strength portions 114 and the inner inclined breathable portions 123 b are arranged alternately in the longitudinal direction.

Each outer inclined breathable portion 123 c is formed in a lateral foot covering portion 12. Each outer inclined breathable portion 123 c has a shape inclined gradually toward the heel region R2, as it extends in the direction from the sole 5 toward the slit 10 h 2. The outer strength portions 115 and the outer inclined breathable portions 123 c are arranged alternately in the longitudinal direction.

In this way, the inside of the article of footwear 1 is ventilated effectively when the leg is swung. More specifically, when the article of footwear 1 is inclined at 45° with respect to the ground in a leg swing phase during running, each inner inclined breathable portion 123 b extends in parallel with the air flow direction, and each outer inclined breathable portion 123 c extends orthogonally to the air flow direction. The inside of the article of footwear 1 is thus ventilated effectively. Therefore, heat inside the article of footwear 1 is dissipated effectively.

Embodiment 4

Next, with reference to FIG. 11 , an upper 10 of an article of footwear 1 according to Embodiment 4 of the present disclosure is described. In connection with Embodiment 4, only those parts different from Embodiment 1 are described, and the description of the same structures, functions, and effects as Embodiment 1 is not herein repeated.

In the present embodiment, a strength portion 110 further includes a plurality of strip-like strength portions 116 arranged at a side of a slit 10 h 2. A plurality of strip-like strength portions 116 are arranged in the intermediate region R3 of a medial foot covering portion 11 and the intermediate region R3 of a lateral foot covering portion 12.

Each strip-like strength portion 116 has a shape extending from the slit 10 h 2 to reach a sole 5, in the height direction of the article of footwear 1.

An intermediate breathable portion 123 includes a plurality of strip-like breathable portions 123 d arranged at a side of the slit 10 h 2. The plurality of strip-like breathable portions 123 d are arranged in the intermediate region R3 of the medial foot covering portion 11 and the intermediate region R3 of the lateral foot covering portion 12. Each strip-like breathable portion 123 d has a shape extending in the height direction from the slit 10 h 2 to reach the sole 5.

The strip-like strength portions 116 and the strip-like breathable portions 123 d are arranged alternately in the longitudinal direction. The length of each of the strip-like strength portions 116 in the longitudinal direction is longer than the length of each of the strip-like breathable portions 123 d in the longitudinal direction.

In this way, shear deformation of the intermediate region R3 is allowed, because each strip-like breathable portion 123 d is deformed when shear stress, in the height direction of the article of footwear 1, occurs in the intermediate region R3 of the upper 10 in operation. Here, “height direction” includes not only the direction orthogonal to the longitudinal direction of the article of footwear 1 but also a direction inclined with respect to the orthogonal direction.

Embodiment 5

Next, with reference to FIG. 12 , an upper 10 of an article of footwear 1 according to Embodiment 5 of the present disclosure is described. In connection with Embodiment 5, only those parts different from Embodiment 1 are described, and the description of the same structures, functions, and effects as Embodiment 1 is not herein repeated.

In the present embodiment, an intermediate breathable portion 123 includes an inner breathable portion 123 e and an outer breathable portion 123 f. The inner breathable portion 123 e and the outer breathable portion 123 f are formed by a single layer portion 120A. In the present embodiment, a breathable portion 120 does not include the toe breathable portion 121 and the heel breathable portion 122.

The inner breathable portion 123 e is disposed in a medial foot covering portion 11. The inner breathable portion 123 e has a shape extending in the width direction from a rear portion of a slit 10 h 2 to reach a sole 5. The inner breathable portion 123 e has a shape gradually increasing in its length in the longitudinal direction, as it extends from the slit 10 h 2 toward the sole 5. Specifically, a rear-end-side edge of the inner breathable portion 123 e has a shape extending gradually toward the heel region R2, as it extends from the slit 10 h 2 toward the sole 5.

The outer breathable portion 123 f is disposed in a lateral foot covering portion 12. The outer breathable portion 123 f has a shape extending in the width direction from a front portion of the slit 10 h 2 to reach the sole 5. The outer breathable portion 123 f has a shape increasing in its length in the longitudinal direction, as it extends from the slit 10 h 2 toward the sole 5. Specifically, a front-end-side edge of the outer breathable portion 123 f has a shape extending toward the toe region R1, as it extends from the slit 10 h 2 toward the sole 5. A rear-end-side edge of the outer breathable portion 123 f has a shape extending toward the heel region R2, as it extends from the slit 10 h 2 toward the sole 5.

A strength portion 110 further includes an inner strength portion 114 and an outer strength portion 115.

The inner strength portion 114 is disposed in the intermediate region R3 of the medial foot covering portion 11. Specifically, the inner strength portion 114 is disposed frontward of the inner breathable portion 123 e. The inner strength portion 114 is contiguous with a toe strength portion 111.

The outer strength portion 115 is disposed in the intermediate region R3 of a lateral foot covering portion 12. Specifically, the outer strength portion 115 is disposed rearward of the outer breathable portion 123 f. The outer strength portion 115 is contiguous with a heel strength portion 112.

In this way, a part that is likely to be creased when the upper 10 is flexed is formed by the breathable portion 120 with relatively high flexibility, and therefore, generation of creases in the above-referenced part when the upper 10 is flexed is suppressed. Accordingly, the fit to the foot in operation is enhanced.

In the present embodiment, as shown in FIG. 13 , the breathable portion 120 may further include a front breathable portion 123 g disposed frontward of the slit 10 h 2. The front breathable portion 123 g is formed by a double layer portion 120B.

Embodiment 6

Next, with reference to FIG. 14 , an upper 10 of an article of footwear 1 according to Embodiment 6 of the present disclosure is described. In connection with Embodiment 6, only those parts different from Embodiment 1 are described, and the description of the same structures, functions, and effects as Embodiment 1 is not herein repeated.

In the present embodiment, a strength portion 110 further includes a plurality of front strength portions 117 disposed frontward of a slit 10 h 2. Each front strength portion 117 has a shape extending in the width direction. The plurality of front strength portions 117 are arranged at intervals in the longitudinal direction.

A breathable portion 120 includes a plurality of front breathable portions 123 g disposed frontward of the slit 10 h 2. Each front breathable portion 123 g has a shape extending in the width direction. The front strength portions 117 and the front breathable portions 123 g are arranged alternately in the longitudinal direction. The length of the front breathable portion 123 g in the longitudinal direction is shorter than the length of the front strength portion 117 in the longitudinal direction.

The front breathable portions 123 g may be disposed in the toe region R1. In the present embodiment, the breathable portion 120 does not include the heel breathable portion 122.

In this way, a part of the upper 10 that is located frontward of the slit 10 h 2 is easily flexed.

Embodiment 7

Next, with reference to FIG. 15 , an upper 10 of an article of footwear 1 according to Embodiment 7 of the present disclosure is described. In connection with Embodiment 7, only those parts different from Embodiment 1 are described, and the description of the same structures, functions, and effects as Embodiment 1 is not herein repeated.

In the present embodiment, a strength portion 110 further includes a front strength portion 117, and a breathable portion 120 includes a plurality of front breathable portions 123 g.

The plurality of front breathable portions 123 g are disposed frontward of a slit 10 h 2. The plurality of front breathable portions 123 g include a plurality of first inclined breathable portions 123 g 1 and a plurality of second inclined breathable portions 123 g 2.

Each of the first inclined breathable portions 123 g 1 has a shape inclined inward in the width direction, as it extends frontward in the longitudinal direction.

Each of the second inclined breathable portions 123 g 2 has a shape inclined outward in the width direction, as it extends frontward in the longitudinal direction.

Each front strength portion 117 is formed by a part enclosed by a plurality of first inclined breathable portions 123 g 1 and a plurality of second inclined breathable portions 123 g 2. Specifically, each front strength portion 117 is tetragonal.

As shown in FIG. 15 , the front breathable portion 123 g and the front strength portion 117 may be disposed at a side of a front part of the slit 10 h 2.

In this way, each front strength portion 117 is deformed when a front part of the upper 10 that is located frontward of the slit 10 h 2 is flexed, and therefore, generation of creases in the above-identified front part is suppressed.

It should be construed that the embodiments disclosed herein are given by way of illustration in all respects, not by way of limitation. It is intended that the scope of the present invention is defined by claims, not by the above description of the embodiments, and encompasses all modifications and variations equivalent in meaning and scope to the claims.

For example, in each of the embodiments described above, the slit 10 h 2 may not be provided and the upper 10 may be formed to have the so-called mono-sock structure. In this case, respective positions of the portions (opening h 10, intermediate breathable portion 123, front breathable portion 123 g, inner strength portion 114, and front strength portion 117, for example) located around the slit 10 h 2 may be identical to those when the slit 10 h 2 is provided.

[Aspects]

It is appreciated by those skilled in the art that a plurality of illustrative embodiments described above are specific examples of the following aspects.

An article of footwear 1 according to an aspect of the present disclosure is an article of footwear 1 including a sole 5 and an upper 10. The upper 10 includes a single fabric portion 100 including a base layer 101 having breathability. The single fabric portion 100 includes: a strength portion 110 including the base layer 101, a breathable layer 102 having breathability, and a strength layer 103 made of a single yarn or a plurality of yarns and connecting the base layer and the breathable layer to each other; and a breathable portion 120 including only the base layer 101 or only the base layer 101 and the breathable layer 102. The base layer 101 has a shape extending from a toe region R1 located at a front end in a longitudinal direction of the article of footwear to reach a heel region R2 located at a rear end in the longitudinal direction of the article of footwear. The strength portion 110 includes: a toe strength portion 111 disposed in the toe region; and a heel strength portion 112 disposed in the heel region. The breathable portion 120 includes an intermediate breathable portion 123 disposed in an intermediate region R3 located between the toe region and the heel region.

In this article of footwear, the base layer forming a part of the strength portion and the breathable portion has a shape extending from the toe region to reach the heel region, and therefore, breathability of the intermediate region given by the intermediate breathable portion, rigidity of the toe region given by the toe strength portion, and rigidity of the heel region given by the heel strength portion can be ensured without performing adhesive bonding or sewing.

Moreover, a ratio of an area of the breathable portion 120 to an area of the strength portion 110 in the intermediate region R3 is preferably higher than a ratio of an area of the breathable portion 120 to an area of the strength portion 110 in each of the toe region R1 and the heel region R2.

In this way, the above-described advantageous effects are obtained effectively. Specifically, in the intermediate region that is to be in contact with the instep of a foot with a relatively large amount of sweat, the area of the breathable portion is relatively larger to ensure the breathability and, in the toe region and the heel region required to have strength, the area of the strength portion is relatively larger to ensure the rigidity.

Moreover, the upper 10 may include: a medial foot covering portion 11 covering at least a part of a medial foot surface of a foot; a lateral foot covering portion 12 covering at least a part of a lateral foot surface of the foot; a topline 10 h 1 that is located between the medial foot covering portion and the lateral foot covering portion in a width direction of the article of footwear, and allows a foot to be inserted and removed; and a slit 10 h 2 located in the intermediate region and extending frontward from the topline in the longitudinal direction.

Moreover, the strength portion 110 may further include a plurality of strip-like strength portions 116 arranged at a side of the slit, each of the plurality of strip-like strength portions 116 may have a shape extending, in a height direction of the article of footwear, from the slit to reach the sole, the intermediate breathable portion 123 may include a plurality of strip-like breathable portions 123 d arranged at a side of the slit, each of the plurality of strip-like breathable portions 123 d may have a shape extending, in the height direction, from the slit to reach the sole, and the strip-like strength portions and the strip-like breathable portions may be arranged alternately in the longitudinal direction.

In this way, each strip-like breathable portion is configured to deform when shear stress occurs in the intermediate region of the upper in motion, in the height direction of the article of footwear, which thereby allows shear deformation of the intermediate region. The “height direction” herein includes not only the direction orthogonal to the longitudinal direction of the article of footwear but also a direction inclines with respect to the orthogonal direction.

In this case, preferably a length, in the longitudinal direction, of each of the strip-like strength portions is greater than a length, in the longitudinal direction, of each of the strip-like breathable portions.

In this way, the above-described advantageous effects are obtained more effectively.

Moreover, the intermediate breathable portion 123 may include: an inner breathable portion 123 e disposed in the medial foot covering portion; and an outer breathable portion 123 f disposed in the lateral foot covering portion, the inner breathable portion 123 e may have a shape extending, in the width direction, from a rear end portion of the slit to reach the sole, and the outer breathable portion 123 f may have a shape extending, in the width direction, from a front end portion of the slit to reach the sole.

In this way, a part that is likely to be creased when the upper is flexed is formed of the breathable portion with relatively high flexibility, and therefore, generation of creases in the above-referenced part when the upper is flexed is suppressed. Accordingly, the fit to the foot in motion is enhanced.

Moreover, the strength portion 110 may include a plurality of front strength portions 117 disposed frontward of the slit, each of the plurality of front strength portions 117 may have a shape extending in the width direction, the breathable portion 120 may include a plurality of front breathable portions 123 g disposed frontward of the slit, each of the plurality of front breathable portions 123 g may have a shape extending in the width direction, and the front strength portions and the front breathable portions may be arranged alternately in the longitudinal direction.

In this way, a part of the upper that is located frontward of the slit is easily flexed.

Moreover, the strength portion 110 may include a plurality of front strength portions 117 disposed frontward of the slit, the breathable portion 120 may include a plurality of front breathable portions 123 g disposed frontward of the slit, the plurality of front breathable portions 123 g may include: a plurality of first inclined breathable portions 123 g 1 inclined inward in the width direction as the plurality of first inclined breathable portions extend frontward in the longitudinal direction; and a plurality of second inclined breathable portions 123 g 2 inclined outward in the width direction as the plurality of second inclined breathable portions extend frontward in the longitudinal direction, and each of the plurality of front strength portions 117 may be formed by a part enclosed by the plurality of first inclined breathable portions and the plurality of second inclined breathable portions.

In this way, each front strength portion is deformed when a front part of the upper that is located frontward of the slit is flexed, and therefore, generation of creases in the above-identified front part is suppressed.

Moreover, the strength portion 110 may further include a plurality of inner strength portions 114 disposed in the intermediate region of the medial foot covering portion, each of the plurality of inner strength portions 114 may have a shape that is inclined gradually toward the toe region as the inner strength portion extends in a direction from the sole toward the slit, the intermediate breathable portion 123 may include a plurality of inner inclined breathable portions 123 b each formed in the medial foot covering portion and having a shape inclined gradually toward the toe region as the inner inclined breathable portion extends in the direction from the sole toward the slit, and the inner strength portions and the inner inclined breathable portions may be arranged alternately in the longitudinal direction.

In this way, the inside of the article of footwear is ventilated effectively when the leg is swung.

Moreover, the strength portion 110 may further include a plurality of intermediate strength portions 113 disposed in the intermediate region, each of the plurality of intermediate strength portions 113 may have a shape extending in a direction from the heel region toward the toe region, the intermediate breathable portion 123 may include a plurality of longitudinal breathable portions 123 a each having a shape extending in the direction from the heel region toward the toe region, the intermediate strength portions and the longitudinal breathable portions may be arranged alternately in the width direction, and the base layer 101 may be disposed to form an outer surface of the upper 10.

In this way, a flow path extending in the direction from the heel region toward the toe region is formed between a foot in the article of footwear and the base layer and between the intermediate strength portions adjacent to each other in the width direction, and therefore, breathability of the intermediate region is effectively ensured.

Moreover, the breathable portion 120 may include: a single layer portion 120A including only the base layer 101; and a double layer portion 120B including only the base layer 101 and the breathable layer 102, and the double layer portion may be disposed frontward of the slit.

REFERENCE SIGNS LIST

1 article of footwear; 5 sole; 10 upper; 10 h 1 topline; 10 h 2 slit; 11 medial foot covering portion; 12 lateral foot covering portion; 100 single fabric portion ; 101 base layer; 102 breathable layer; 103 intermediate layer; 110 strength portion; 111 toe strength portion; 112 heel strength portion; 113 intermediate strength portion; 114 inner strength portion; 115 outer strength portion; 116 strip-like strength portion; 117 front strength portion; 120 breathable portion; 120A single layer portion; 120B double layer portion; 121 toe breathable portion; 122 heel breathable portion; 123 intermediate breathable portion; 123 a longitudinal breathable portion; 123 b inner inclined breathable portion; 123 c outer inclined breathable portion; 123 d strip-like breathable portion; 123 e inner breathable portion; 123 f outer breathable portion; 123 g front breathable portion; 123 g 1 first inclined breathable portion; 123 g 2 second inclined breathable portion; h 10 opening; h 20 insert hole; R1 toe region; R2 heel region; R3 intermediate region 

1. An article of footwear comprising a sole and an upper, wherein the upper comprises a single fabric portion including a base layer having breathability, the single fabric portion comprises: a strength portion including the base layer, a breathable layer having breathability, and a strength layer made of a single yarn or a plurality of yarns and connecting the base layer and the breathable layer to each other; and a breathable portion including only the base layer or only the base layer and the breathable layer, the base layer has a shape extending from a toe region located at a front end in a longitudinal direction of the article of footwear to reach a heel region located at a rear end in the longitudinal direction of the article of footwear, the strength portion comprises: a toe strength portion disposed in the toe region; and a heel strength portion disposed in the heel region, and the breathable portion comprises an intermediate breathable portion disposed in an intermediate region located between the toe region and the heel region.
 2. The article of footwear according to claim 1, wherein a ratio of an area of the breathable portion to an area of the strength portion in the intermediate region is higher than a ratio of an area of the breathable portion to an area of the strength portion in each of the toe region and the heel region.
 3. The article of footwear according to claim 1, wherein the upper includes: a medial foot covering portion covering at least a part of a medial foot surface of a foot; a lateral foot covering portion covering at least a part of a lateral foot surface of the foot; a topline that is located between the medial foot covering portion and the lateral foot covering portion in a width direction of the article of footwear, and allows a foot to be inserted and removed; and a slit located in the intermediate region and extending frontward from the topline in the longitudinal direction.
 4. The article of footwear according to claim 3, wherein the strength portion further comprises a plurality of strip-like strength portions arranged at a side of the slit, each of the plurality of strip-like strength portions has a shape extending, in a height direction of the article of footwear, from the slit to reach the sole, the intermediate breathable portion comprises a plurality of strip-like breathable portions arranged at a side of the slit, each of the plurality of strip-like breathable portions has a shape extending, in the height direction, from the slit to reach the sole, and the strip-like strength portions and the strip-like breathable portions are arranged alternately in the longitudinal direction.
 5. The article of footwear according to claim 4, wherein a length, in the longitudinal direction, of each of the strip-like strength portions is greater than a length, in the longitudinal direction, of each of the strip-like breathable portions.
 6. The article of footwear according to claim 3, wherein the intermediate breathable portion comprises: an inner breathable portion disposed in the medial foot covering portion; and an outer breathable portion disposed in the lateral foot covering portion, the inner breathable portion has a shape extending, in the width direction, from a rear end portion of the slit to reach the sole, and the outer breathable portion has a shape extending, in the width direction, from a front end portion of the slit to reach the sole.
 7. The article of footwear according to claim 3, wherein the strength portion comprises a plurality of front strength portions disposed frontward of the slit, each of the plurality of front strength portions has a shape extending in the width direction, the breathable portion comprises a plurality of front breathable portions disposed frontward of the slit, each of the plurality of front breathable portions has a shape extending in the width direction, and the front strength portions and the front breathable portions are arranged alternately in the longitudinal direction.
 8. The article of footwear according to claim 3, wherein the strength portion comprises a plurality of front strength portions disposed frontward of the slit, the breathable portion comprises a plurality of front breathable portions disposed frontward of the slit, the plurality of front breathable portions comprise: a plurality of first inclined breathable portions inclined inward in the width direction as the plurality of first inclined breathable portions extend frontward in the longitudinal direction; and a plurality of second inclined breathable portions inclined outward in the width direction as the plurality of second inclined breathable portions extend frontward in the longitudinal direction, and each of the plurality of front strength portions is formed by a part enclosed by the plurality of first inclined breathable portions and the plurality of second inclined breathable portions.
 9. The article of footwear according to claim 3, wherein the strength portion further comprises a plurality of inner strength portions disposed in the intermediate region of the medial foot covering portion, each of the plurality of inner strength portions has a shape that is inclined gradually toward the toe region as the inner strength portion extends in a direction from the sole toward the slit, the intermediate breathable portion comprises a plurality of inner inclined breathable portions each formed in the medial foot covering portion and having a shape inclined gradually toward the toe region as the inner inclined breathable portion extends in the direction from the sole toward the slit, and the inner strength portions and the inner inclined breathable portions are arranged alternately in the longitudinal direction.
 10. The article of footwear according to claim 3, wherein the strength portion further comprises a plurality of intermediate strength portions disposed in the intermediate region, each of the plurality of intermediate strength portions has a shape extending in a direction from the heel region toward the toe region, the intermediate breathable portion comprises a plurality of longitudinal breathable portions each having a shape extending in the direction from the heel region toward the toe region, the intermediate strength portions and the longitudinal breathable portions are arranged alternately in the width direction, and the base layer is disposed to form an outer surface of the upper.
 11. The article of footwear according to claim 3, wherein the breathable portion comprises: a single layer portion including only the base layer; and a double layer portion including only the base layer and the breathable layer, and the double layer portion is disposed frontward of the slit. 